Thomas holliday



' UNITED STATES PATENT OFFICE.

THOMAS HOLLIDAY, on HUDD-ERSFIELD, couNrY or YORK, ENGLAND.

PRODUCING Azo COLORS UPON VEGETABLE FIBER.

SPECIFICATION forming part of Letters Patent No. 252,317, dated January17, 1882. Application filed April 21, 1881. (No specimens.) Patented inEngland April 14, 1881.

To all whom it may concern:

'Be it known that I, THOMAS HOLLIDAY, a subject of the Queen of GreatBritain and Ireland, residing at Huddersfield, county of York,

' ing it with one of the component bodies from which the azo color is tobe produced. By means of this process the element of the azo color firstbrought in contact with the oil upon the fiber enters into combinationtherewith,

V and, with the oil, cannot be washed from the fiber, but becomes anintegral part of the substance which is to enter into combination withthe second element in order to produce the azo color.

The azo colors to which I referare those formed by combinations made onthe fiber of diazo or diazo-azo compounds with the phenols, naphthols,or any other of the phenolic bodies, whether further substituted or not.

As an example of my process the following operations maybe performed:Cotton yarn may be steeped in a solution of, say, three per centum ofoil, preferably sulphonated and neutralized with soda. The superfluousoil in the yarn is then wrung out and the yarn dried, and after the oilis sufficiently oxidized on the fiber I proceed to wash off in a weaksolution of sal-soda. I then dry the yarn,then wash ofi" in water, andagain dry the yarn. The yarn is then ready for the-formation of an azocolor. To effect this formation of the color the yarnthus prepared maybe passed through a one percent.

solution of naphthol in hot water. The naph;

thol andoil enter into acombination, and when the yarn is cooleditmay bethen passed through aone per cent. solution of, say, the diazoeolnpoundof amidoazo-benzole, and then passed through a weakalkaline solution,the color thus being formed in combination with theoxidized oil as wellas the fiber. The color thus formed may easily be distinguished fromcolor formed without the combinationof the oil by its-fastness andbetter color under soaping or similar treatment. I

Instead of first treating the oiled yarn with the naphthol orsimilarbody, I may first treat it with the azo compound; but I prefer themethod stated. I 1

I do not claim, broadly, the oiling of fiber previous to subjecting itto a dye-bath, the same being old; but

What I claim as my invention, and desire to secure by Letters Patent,is-

The process of producing a'fust azo color upon vegetable fiber, whichconsists in subjecting the fiber to the action of oil followed by-analkali, so as to oxidize the oilon the fiber, subsequently subjectingthe oiled fiber to the action of a naplithol or phenolic body, and thenof producing the azo color upon the fiber by treating the same with adinzo 00111- pound, thereby fastening the color upon the fiber inconjunction with the oil, as distinguished from the process ofpresenting the fiber to a color already formed, substantially asdescribed.

In testimony whereof I, T'HoMAs HOLLIDAY, have signed my name to thisspecification in the presence of two subscribing witnesses.

THOMAS HOLLI DAY.

